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COS2626/201/1/2018

Tutorial Letter 201/1/2018

Computer Networks

COS2626

Semester 1

School of Computing

This tutorial letter contains the solution to Assignment 01 for semester1

BARCODE

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CONTENTS

Page

1 INTRODUCTION ............................................................................................................................ 3

2 ERRATA – QUESTION 20 ............................................................................................................. 3

3 SOLUTION TO ASSIGNMENT 01: SEMESTER 1 ........................................................................ 4

To be admitted to the examination, you must submit at least ONE assignment before the due date. The due dates for the assignments are as follows: Assignment 01 9th March 2018 Assignment 02 29th March 2018 Assignment 03 13th April 2018 Your semester mark and the examination mark will determine your final mark. The semester

mark is based on the marks awarded for each assignment.

COS2626/201/1/2018

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1 INTRODUCTION

Dear Student,

This tutorial letter, designated COS2626/201/1/2018, contains the solution to Assignment 01 for

Semester 1.

You should have at this stage received the following study material:

COS2626/101/3/2018 (Start-up letter - Available under Official Study Material on

myUNISA)

COS2626/201/1/2018 (This tutorial letter – Solution to Assignment 01 - Available under

Additional Resources on myUNISA)

2 ERRATA – QUESTION 20

Unfortunately, there is WAS error in question 20 of Assignment 01. The correct option is option c but was been captured as option a on the system.

BEST WISHES FOR A SUCCESSFUL YEAR OF STUDY THE LECTURERS

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3 SOLUTION TO ASSIGNMENT 01: SEMESTER 1

Introduction to Networking

Question 1

Which TWO encryption protocols might be used to provide secure transmissions for browser

and Web server communications?

a. HTTP (Hypertext Transfer Protocol) and HTTPS (HTTP Secure)

b. SSL (Secure Sockets Layer) and TLS (Transport Layer Security)

c. SSL and HTTP

d. TCP (Transmission Control Protocol) and UDP (User Datagram Protocol)

Page: 3, Chapter 1

Question 2

Which client-server application allows an administrator to control a remote computer, but does

not encrypt or secure the communication between the client and the server?

a. Telnet

b. Remote Desktop

c. FTP (File Transfer Protocol)

d. SSH (Secure Shell)

Page: 4, Chapter 1

Question 3

Which THREE types of services are considered part of unified communications or

convergence?

a. File transfers; print services; conversational voice

b. User authentication; streaming live audio and video; print services

c. Web services; email services file services

d. Conversational voice; streaming live audio and voice, streaming stored

audio and voice

Page: 6, Chapter 1

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Question 4

In the following diagram, a Windows domain uses the network model to control

access to the network, where security on each computer or device is controlled by a centralized

database on a domain controller.

a. client-server

b. peer-to-peer

Page: 10, Figure 1-5, Chapter 1

Question 5

A network consists of seven computers and a network printer all connected directly to one

switch. Which network topology does this network use?

a. bus topology

b. ring topology

c. hub topology

d. star topology

Page: 12, Chapter 1

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Question 6

In Question 5, suppose a new switch is connected to the first switch by way of a network cable

and three computers are connected to the new switch. Which network topology is now used?

a. star-ring topology

b. star-bus topology

c. hybrid topology

d. mesh topology

Page: 13, Chapter 1

Question 7

Which one of the following typically outlines the proper handling procedures for substances

such as chemical solvents and how to dispose of them?

a. TCSP (Toxic Chemical Safety Procedure)

b. (DHWDS) Dangerous and Hazardous Waste Disposal Sheet

c. (ECHS) Environmental Chemical Hazard Sheet

d. (MSDS) Material Safety Data Sheet

Page: 27, Chapter 1

How Computers Find Each Other on Networks

Question 8

The last part of an FQDN (Fully Qualified Domain Name) is called the _______.

a. host name

b. domain name

c. TLD (Top-Level Domain)

d. resolver

Page: 56, Chapter 2

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Question 9

You have introduced a new secondary DNS (Domain Name Server) server online and notice

that your monitoring software reports a significant increase in network traffic. Which TWO hosts

on your network are likely to be causing the increased traffic and why?

a. The caching and primary DNS servers, because the caching server is requesting zone

transfers from the primary server

b. The secondary and primary DNS servers, because the secondary server is

requesting zone transfers from the primary server

c. The root and primary DNS servers, because the primary server is requesting zone

transfers from the root server.

d. The Web server and primary DNS server, because the Web server is requesting zone

transfers from the primary DNS server.

Page: 61, Chapter 2

Question 10

Several types of records, called resource records are kept in a DNS database. A record is

used for reverse lookups, to provide a host name when you know its IP address.

a. A (Address)

b. AAAA (Address) record

c. CNAME (Canonical Name)

d. PTR (Pointer)

Page: 63, Chapter 2

Question 11

What decimal number corresponds to the binary number 11111111?

a. 255

b. 256

c. 127

d. 11111111

Page: 67, Chapter 2

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Question 12

The following diagram depicts the network portion and host portion for each class of IP address.

Which IP class is denoted by the symbol ‘C’ in the following diagram?

a. Class A

b. Class B

c. Class C

d. Class D


Question 13

Which statement (s) regarding NAT (Network Address Translation) is (are) CORRECT?

i. NAT is a technique designed to conserve public IP addresses needed by a network.

ii. One of the advantages of NAT is security; the gateway hides the entire private network

behind this one address.

iii. Two variations of NAT are SNAT (Static Network Address Translation) and ENAT

(Extensive Network Address Translation).

a. only i and ii

b. only ii and iii

c. only i

d. i, ii and iii

Pages: 71-72, Chapter 2

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Question 14

Which TWO ipconfig commands are used to show the DNS resolver cache information and

clear the name resolver cache?

i. ipconfig /releasedns

ii. ipconfig /alldns

iii. ipconfig /displaydns

iv. ipconfig /flushdns

a. i and ii

b. ii and iii

c. iii and iv

d. i and iv

Page: 83, Table 2-8, Chapter 2

How Data is Transported over Networks

Question 15

At what layer of the OSI (Open Systems Interconnection) model would a TCP or UDP header be

added to a payload?

a. Layer 7

b. Layer 4

c. Layer 2

d. Layer 1

Page: 107, Chapter 3

Question 16

UDP’s lack of sophistication makes it efficient than TCP.

a. more

b. less


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Question 17

Study the following list of CHARACTERISTICS.

Layer 2 protocol that uses IP in Layer 3

Used with IPv4

Obtains MAC (physical) address of host or node

Creates database that maps IP address to MAC addresses

The above list depicts the characteristics of the protocol.

a. RARP (Reverse Address Resolution Protocol)

b. ARP (Address Resolution Protocol)

c. DHCP (Dynamic Host Configuration Protocol)

d. ICMP (Internet Control Message Protocol)


Question 18

Which one of the following routing protocol enables routers to communicate beyond

neighbouring routers, allowing each router to create a map of an entire network?

a. Distance-vector routing protocols

b. Link-state routing protocols

c. Exterior gateway protocols

d. Border gateway protocols


Question 19

Routers rate the reliability and priority of a routing protocol’s data based on certain criteria.

Which routing protocol criteria is defined as the time it takes to recognize a best path change in

the event of a change network outage?

a. administrative distance detection

b. convergence time

c. overhead calculation

d. downed path detection


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Question 20

Which one of the following routing protocols are used by border routers and exterior routers to

distribute data outside of an autonomous system?

a. OSPF (Open Shortest Path First)

b. EIGRP (Enhanced Interior Gateway Routing Protocol)

c. BGP (Border Gateway Protocol)

d. IS-IS (Intermediate System to Intermediate System)


Question 21

By default, the pathping command sends HOW MANY pings per hop?

a. 50

b. 100

c. 200

d. 500


Structured Cabling and Networking Elements

Question 22

Which standard is also known as structured cabling?

a. TIA/EIA-568 Commercial Building Wiring Standard

b. TIA/EIA RS-232 (Recommended Standard 232)

c. TIA/EIA 568A Standard

d. TIA/EIA 568BA Standard


Question 23

Which one of the following is not a likely source of EMI (Electromagnetic Interference)?

a. power lines

b. motors

c. fiber optic cables

d. microwaves


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Question 24

The radius of the maximum arc into which you can loop a cable without impairing data

transmission is known as .

a. metal stress factor

b. arc coefficient

c. bend radius

d. flex rating


Question 25

Which networking device on today’s racks does nothing to the data transmitted on a line other

than pass it along through the connection?

a. Patch panel

b. Punch-down block

c. 110 block

d. Hub


Question 26

Which TWO terms are used to describe a UPS (Uninterruptible Power Supply) that provides

continuous voltage to a device by switching virtually instantaneously to the battery when it

detects a loss of power?

i. offline UPS

ii. standby UPS

iii. standby power supply

iv. failover power supply

a. i and ii

b. ii and iii

c. iii and iv

d. i and iv


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Question 27

What are the MINIMUM and MAXIMUM sizes for an Ethernet frame?

a. 46 and 64 bytes

b. 46 and 128 bytes

c. 64 and 1518 bytes

d. 64 and 1600 bytes


Question 28

In the context of building and maintaining network documentation, which one of the following

terms best describes the process of discovering and identifying the devices on a network?

a. network diagram

b. wiring scheme

c. network mapping

d. network graphing


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Network Cabling

Question 29

Study the following diagram of a typical analog signal. ‘C’ denotes the wave’s _________ and is

________________________.

a. amplitude; a measure of its strength at any given point

b. wavelength; the distance between corresponding points on a wave’s cycle

c. phase; the progress of a wave over time in relationship to a fixed point

d. voltage; the strength of the signal

Pages: 211-212, Figure 5-1, Chapter 5

Question 30

In modulation, a simple wave called a (n) ____ wave, is combined with another analog signal to

produce a unique signal that gets transmitted from one node to another.

a. carrier

b. data

c. information

d. discrete


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Question 31

_ ___ is a technology used with fiber-optic cable that enables one fiber-optic connection

to carry multiple light signals simultaneously.

a. Statistical multiplexing

b. WDM (Wavelength Division Multiplexing)

c. TDM (Time Division Multiplexing)

d. FDM (Frequency Division Multiplexing)


Question 32

What type of connectors do 'A' and 'B' in the following diagram respectively represent?

a. RJ (Registered Jack) -45; RJ-11

b. ST (Straight Tip); SC (Subscriber connector or Standard Connector)

c. LC (Local Connector); MT-RJ (Mechanical Transfer Registered Jack)

d. DB-25; DB-9

Page: 237, Figures 5-28 – 5-29, Chapter 5

Question 33

A hardware component that can be changed without disrupting operations is known as ____.

a. fast-synching

b. hot-synching

c. hot-swappable

d. fast-swappable


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Question 34

The following diagram illustrates a .

a. SFP (small form-factor pluggable) transceiver for use with fiber connections

b. GBIC (Gigabit interface converter) with an RJ-45 port

c. Expansion board NIC

d. PCIe (Peripheral Component Interconnect Express) expansion board NIC

Pages: 247-248, Figure 5-41, Chapter 5

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Question 35

Study the following diagram.

a. This diagram illustrates how a digital signal is distorted by noise and then repeated.

b. This diagram illustrates how an analog signal is distorted by noise and then repeated.

c. This diagram illustrates how a digital signal is distorted by noise and then amplified.

d. This diagram illustrates how an analog signal is distorted by noise and then amplified.


Wireless Networking

Question 36

Which of the following are TWO different types of attacks against Bluetooth connections that

can be used to send unsolicited data, or download data without permission?

i. bluejacking

ii. bluesnarfing

iii. bluesniffing

iv. bluespoofing

a. i and ii

b. ii and iii

c. iii and iv

d. i and iv


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Question 37

Study the following statements:

Wireless nodes transmit directly to each other

Use wireless NICs

• No intervening connectivity device

Which WLAN (Wireless LAN) Architecture is described by the above statements?

a. infrastructure WLAN

b. ad hoc WLAN

c. proprietary WLAN

d. open source WLAN


Question 38

Suppose your Windows workstation's wireless network adapter is configured to use the 802.11b

wireless networking standard. Also, suppose a café you visit has an 802.11g access point.

Assuming you have the correct SSID (Service Set Identifier) and logon credentials, what will

happen when you attempt to associate with the café's wireless network?

a. Your wireless networking client will be able to see the access point, but unable to

associate with it.

b. Your wireless client will not be able to see the access point.

c. Your wireless networking client will be able to see the access point and

successfully associate with it.

d. Your wireless networking client will be able to see the access point and attempt to

associate with it, but the incompatible frequencies will prevent successful authentication.


Question 39

In IEEE (Institute of Electrical and Electronics Engineers) terminology, a group of stations that

share an access point are said to be part of a .

a. ESS (Extended Service Set)

b. BSS (Basic Service Set)

c. MSS (Modified Service Set)

d. GSS (Generic Service Set)


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Question 40

Which 802.11 frame type is involved in association and reassociation, including probe and

beacon frames?

a. management frames

b. control frames

c. data frames

d. extended frames


© UNISA 2018

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